Suggestion: Famitracker-like groove tables

[coffeevalenbat]

An issue with chaining speed commands (Fxx) is that it coggles up effect slots that could be used for other things when in reality it could be easily avoided, in my 5.5 mod of hUGEDriver I implemented very simple speed groove tables, where 4 bytes are cycled through on every row to set the song speed, this was quite messy to input using a modified 7xx effect but it could be implemented natively into the tracker/driver much more easily.

[SuperDisk]

I implemented this in this branch, basically just made for Kabcorp:

• Tracker: https://github.com/SuperDisk/hUGETracker/tree/grooves
• Driver: https://github.com/SuperDisk/hUGEDriver/tree/grooves

but I'm not sure if I want to merge it into the mainline... it would necessitate putting out UGE v7 which is kind of annoying, and I'm already kind of on the fence about if the driver is getting too bloated.